package com.tanhua.server.interceptor;

import cn.hutool.core.util.StrUtil;
import com.tanhua.common.pojo.User;
import com.tanhua.common.utils.NoAuthorization;
import com.tanhua.common.utils.UserThreadLocal;
import com.tanhua.server.service.UserService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;
import org.springframework.web.method.HandlerMethod;
import org.springframework.web.servlet.HandlerInterceptor;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

/**
 * 采用拦截器,进行token校验
 */
@Component
public class UserTokenInterceptor implements HandlerInterceptor {

    @Autowired
    private UserService userService;

    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {

        //校验handler是否是HandlerMethod
        if (!(handler instanceof HandlerMethod)){
            return true;
        }

        //判断是否添加了@NoAuthorization注解
        if (((HandlerMethod) handler).hasMethodAnnotation(NoAuthorization.class)){
            return true;
        }

        //从请求头中获取token
        String token = request.getHeader("Authorization");
        if (StrUtil.isNotEmpty(token)){
            User user = this.userService.queryUserByToken(token);
            if (null != user){
                //token有效
                //将user放入到ThreadLocal中
                UserThreadLocal.set(user);
                return true;
            }
        }

        //token无效,返回状态码401
        response.setStatus(401);    //无权限

        return false;
    }


    @Override
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {
        //从ThreadLocal中移除user对象
        UserThreadLocal.remove();
    }
}
